05000333/LER-1979-044-03, /03L-0 on 790720:mainstream Line Tunnel Radiation Monitor D Drifted So That Indicator & Trip Point Were Approx 5.5% Low.Caused by Instrument Drift.Instrument Calibr & Tested

/03L-0 on 790720:mainstream Line Tunnel Radiation Monitor D Drifted So That Indicator & Trip Point Were Approx 5.5% Low.Caused by Instrument Drift.Instrument Calibr & Tested

ML19242A840
Person / Time
Site:	FitzPatrick
Issue date:	08/03/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19242A832	List: 05000333/LER-1979-044, Forwards LER 79-044/03L-0 05000333/LER-1979-044-03, /03L-0 on 790720:mainstream Line Tunnel Radiation Monitor D Drifted So That Indicator & Trip Point Were Approx 5.5% Low.Caused by Instrument Drift.Instrument Calibr & Tested
References
LER-79-044-03L, LER-79-44-3L, NUDOCS 7908060448
Download: ML19242A840 (2)

LER-1979-044, /03L-0 on 790720:mainstream Line Tunnel Radiation Monitor D Drifted So That Indicator & Trip Point Were Approx 5.5% Low.Caused by Instrument Drift.Instrument Calibr & Tested

Event date:
Report date:
3331979044R03 - NRC Website

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POWER AUTHORITY OF T!8E STATE OF VLW YORK JAMES A. FIT: PATRICK NUCLEAR PCWiR PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-044/03L-0 Page 1

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Nhile in a cold shutdown condition, during the conduct of Instrument Surveillance Procedure F-ISP-64-1 titled " Main Steam Line High Radiation", the "D" nain steam line tunnel radiation monitor (17-RM-251D) was found to have drifted in such a manner that its indicator and its trip point were approximately 5.5% low.

This instrument drift could have resulted in the failure of the instrument to trip at three timcs the normal full power radiation level in the main steam line tunnel as required by Technical Specifications Appendix A, Table 3.2-1.

Both instruments in the reduncant safety system channel (17-RM-251A and 17-RM-251C) in addition to the second instrument in the same safety system channel 7-RM-251B) were operabic. Therefore, the event did not represent a significant h, d

to the public health and safety.

The instrument was immediately calibrated and tested wit? satisfactory restits utilizing F-ISP-54-1.

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